The GOP lawmaker was at the White House to discuss the president's attempts to overturn election results.
Research has, however, linked his rallies to hundreds of COVID-19 deaths.
The president-elect said he plans to nominate Janet Yellen to head the Treasury Department in an historic first.
Former top cybersecurity official Chris Krebs, a lifelong Republican who was fired by Trump, said claims undercutting the election results were “nonsense.”
Lawyers' baseless arguments of voter fraud "get shredded in any courtroom they’re dumb enough to step into," John Fetterman snapped.
Michigan Rep. Paul Mitchell called on the president to give it up for the "sake of our Nation."
The president-elect's office said Biden would likely be in a walking boot for several weeks.
The briefings are finally starting up after a lengthy delay triggered by Trump's refusal to concede the election victory to Biden.
The president-elect said the group brings "diverse perspectives to their work and a shared commitment to building this country back better.”
Maria Bartiromo sat back and let the president push disinformation to her hundreds of thousands of viewers.